import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/index")
public class IndexServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession(false);
        if (session == null) return;
        String username = (String) session.getAttribute("username");
        Integer count = (Integer) session.getAttribute("count");
        count++;
        session.setAttribute("count", count);
        if (username == null) return;
        resp.setContentType("text/html;charset=utf8");
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("<h3>" + username + ", 欢迎登录!</h3>");
        stringBuilder.append("<br>");
        stringBuilder.append("访问次数: " + count);
        resp.getWriter().write(stringBuilder.toString());
    }
}
